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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Array/Symbol.iterator below:

Array.prototype[@@iterator]() - JavaScript | MDN

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El valor inicial de la propiedad @@iterator es el mismo objeto de función que el valor inicial de la propiedad values().

El valor inicial dado por el iterador values(). Por defecto, usar arr[Symbol.iterator] devolverá la función values().

var arr = ["w", "y", "k", "o", "p"];
var eArr = arr[Symbol.iterator]();
// nuestro navegador debe ser compatible con el bucle for..of
// y variables let-scoped en bucles for
for (let letter of eArr) {
  console.log(letter);
}

var arr = ["w", "y", "k", "o", "p"];
var eArr = arr[Symbol.iterator]();
console.log(eArr.next().value); // w
console.log(eArr.next().value); // y
console.log(eArr.next().value); // k
console.log(eArr.next().value); // o
console.log(eArr.next().value); // p

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